finetuning vocoder

[Pked01]

Hi
I am new to field of VC, I am trying to finetune model for specific speakers to generate output more like specific speaker.
After going through repo, I though best approach would be to fine tune vocoder.(suggested here #11)
From there I went to this repo (as suggested in the readme)
https://github.com/jik876/hifi-gan
there when i tested other pretrained model, such as LJ_V3,LJ_FT_T2_V3
when using these models in output i am getting just noise?
output : https://drive.google.com/file/d/19xXGF_u0EBtaiFDlg5CkAiEi8Xzc_dd3/view?usp=share_link

--> Can you elaborate on how to finetune on custom data (Specific speakers)? I have 15-20 min data each for 10 speaker ..will that be sufficient?
--> is finetuning vocoder sufficient ? for getting speech for specific users?
--> how to use other models available on hifigan repo? in ppg repo? what config change i need to do?